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frosja888 [35]
3 years ago
7

7х + 2y = -1 3х — 4y = 19

Mathematics
1 answer:
Deffense [45]3 years ago
3 0

Answer:

x = 1, y = -4

Step-by-step explanation:

7х + 2y = -1  ------ eq1

3х — 4y = 19 ------ eq2

multiply eq1 by 2

2 x (7х + 2y = -1)

14x + 4y = -2 -----eq3

by elimination, add equation 2 and 3

14x + 3x = 19-2

17x = 17  (divide both sides by 17)

x = 1  (answer)

substitute into eq1

7(1) + 2y = -1  (subtract 7 from both sides)

2y = -1 -7

2y = -8 (divide both sides by 2)

y = -8/2 = -4 (answer)

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